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Transformers

Transformers
Material used for construction of transformer core is usually

Wood
Silicon steel
Aluminium
Copper

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Transformers
The hum in a transformer is mainly attributed to

oil in the transformer
load changes
mechanical vibrations
magnetostriction

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Transformers
Natural oil cooling is used for transformers up to a rating of

1000 kVA
250 kVA
3000 kVA
500 kVA

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Transformers
The primary coil of a transformer is connected to a 60 V ac source. The secondary coil is connected to a 330 load. The turns ratio is 3:1. What is the secondary voltage?

2 V
20 V
18 V
180 V

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Transformers
How are transformers generally cooled for installations rated at less than 5kVA ?

None of the listed here
Air cooled
Water cooled
Oil cooled

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Transformers
In the short circuit test on a transformer, we generally short circuit ______

High voltage winding
Either low or high voltage winding
Low voltage winding
None of the listed here

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MORE MCQ ON Transformers

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